Question

calculate mass of 2.5 grams atom of magnesium

Answer 1

this is a question of chemistry not geography

Answer 2

 find below the solution to the asked query.

a) Mass of 1 gram atom of Mg = 24 g
So, mass of 2.5 gram atoms of Mg = 24×2.5 = 60 g

b) Atomic mass of N = 14 g
i.e. number of gram atoms in 14 g of N = 1
So, number of gram atoms in 1.4 g of N = 114×1.4=0.1